This paper discusses the concept of main development tunnels and the classifications of development methods and describes the application of all kinds of development methods in gold mines.
本文讨论了主要开拓巷道的概念和开拓方法的分类，以及各种开拓方法在黄金矿山的应用。
The mechanism of production and the hazard of the acid waste water from all kinds of sulfurous mines are studied in this paper.
讨论了普遍分布的各种含硫矿山所排放的酸性废水的产生机理和对水质产生的环境危害影响。
They pulled loads of wood, carried things up to the mines, and did all kinds of work that horses did in the Santa Clara Valley.
他们拉着一捆捆的木材，将东西运到矿区，还干着在圣克拉拉山谷里只有马才干的各种杂活。
Nonmetal minerals are the predominant mineral resource of Sichuan, where there are all kinds of major mines of abundant reserves and predominant building materials and chemical materials.
非金属矿是四川优势矿产资源，主要矿种齐全、储量丰富，建材资源、化工原料资源优势突出，常用矿产与优势矿产吻合程度高；
Nonmetal minerals are the predominant mineral resource of Sichuan, where there are all kinds of major mines of abundant reserves and predominant building materials and chemical materials.
非金属矿是四川优势矿产资源，主要矿种齐全、储量丰富，建材资源、化工原料资源优势突出，常用矿产与优势矿产吻合程度高；
应用推荐